package top.ffhome.framework.handler;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import top.ffhome.common.constant.HttpStatus;
import top.ffhome.common.core.domain.BaseEntity;
import top.ffhome.common.core.domain.model.LoginUser;
import top.ffhome.common.exception.ServiceException;
import top.ffhome.common.utils.SecurityUtils;
import top.ffhome.common.utils.StringUtils;

import java.util.Date;

/**
 * MP注入处理器
 */
@Slf4j
public class CreateAndUpdateMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        try {
            if (metaObject != null && metaObject.getOriginalObject() instanceof BaseEntity) {
                BaseEntity baseEntity = (BaseEntity) metaObject.getOriginalObject();
                Date current = new Date();
                // 创建时间为空 则填充
                if (baseEntity.getCreateTime() == null) {
                    baseEntity.setCreateTime(current);
                }
                // 更新时间
                baseEntity.setUpdateTime(current);

                String username = getLoginUsername();
                // 当前已登录 且 创建人为空 则填充
                if (StringUtils.isNotBlank(username)
                        && StringUtils.isBlank(baseEntity.getCreateBy())) {
                    baseEntity.setCreateBy(username);
                }
                // 当前已登录 则填充
                if (StringUtils.isNotBlank(username)) {
                    baseEntity.setUpdateBy(username);
                }
            }
        } catch (Exception e) {
            throw new ServiceException("自动注入异常 => " + e.getMessage(), HttpStatus.UNAUTHORIZED);
        }
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        try {
            if (metaObject != null && metaObject.getOriginalObject() instanceof BaseEntity) {
                BaseEntity baseEntity = (BaseEntity) metaObject.getOriginalObject();
                Date current = new Date();
                // 更新时间填充(不管为不为空)
                baseEntity.setUpdateTime(current);
                String username = getLoginUsername();
                // 当前已登录 更新人填充(不管为不为空)
                if (StringUtils.isNotBlank(username)) {
                    baseEntity.setUpdateBy(username);
                }
            }
        } catch (Exception e) {
            throw new ServiceException("自动注入异常 => " + e.getMessage(), HttpStatus.UNAUTHORIZED);
        }
    }

    /**
     * 获取登录用户名
     */
    private String getLoginUsername() {
        LoginUser loginUser;
        try {
            loginUser = SecurityUtils.getLoginUser();
        } catch (Exception e) {
            log.warn("自动注入警告 => 用户未登录");
            return null;
        }
        return loginUser.getUserId() + "_" + loginUser.getUsername();
    }
}
